| Engineering Journal 6.6.1: Naming or numbering an IP protocol The name or number of an IP protocol can be one of the keywords eigrp, gre, icmp, igmp, igrp, ip, ipinip, nos, ospf, tcp, or udp , or an integer in the range 0 to 255 , representing an IP protocol number. To match any Internet protocol (including ICMP, TCP, and UDP), use the keyword ip. The protocols and their corresponding numbers are listed in RFC 1700, along with port numbers.